miniblog.

Ooh, difftastic is now listed on the official git website! https://git-scm.com/tools/command-line

I'm increasingly doubtful that commit messages should be entirely immutable. I sometimes find myself editing or commenting on merged pull requests, to help future readers. Phabricator appended a URL to commit messages, which helped. In principle PR merging could do the same thing.

ASTs typically discard comments, and that's usually what you want. The only time (AFAICS) that preserving comments is useful is for writing a code formatter. Could you write a formatter in terms of a list of lexemes? A CST is a non-trivial bit of code for one use case.